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<title>Set up start namespace declaration handler</title>
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<h1 class="refname">xml_set_start_namespace_decl_handler</h1>
<p class="verinfo">(PHP 4 >= 4.0.5, PHP 5)</p><p class="refpurpose"><span class="refname">xml_set_start_namespace_decl_handler</span> — <span class="dc-title">
Set up start namespace declaration handler
</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.xml-set-start-namespace-decl-handler-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><strong>xml_set_start_namespace_decl_handler</strong></span>
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$parser</code></span>
, <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$handler</code></span>
)</div>
<p class="para rdfs-comment">
Set a handler to be called when a namespace is declared. Namespace
declarations occur inside start tags. But the namespace declaration start
handler is called before the start tag handler for each namespace declared
in that start tag.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.xml-set-start-namespace-decl-handler-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">parser</code></em></span>
<dd>
<p class="para">
A reference to the XML parser.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">handler</code></em></span>
<dd>
<p class="para">
<em><code class="parameter">handler</code></em> is a string containing the name of a
function that must exist when <span class="function"><a href="function.xml-parse.html" class="function">xml_parse()</a></span> is called
for <em><code class="parameter">parser</code></em>.
</p>
<p class="para">
The function named by <em><code class="parameter">handler</code></em> must accept
three parameters, and should return an integer value. If the
value returned from the handler is <strong><code>FALSE</code></strong> (which it will be if no
value is returned), the XML parser will stop parsing and
<span class="function"><a href="function.xml-get-error-code.html" class="function">xml_get_error_code()</a></span> will return
<strong><code>XML_ERROR_EXTERNAL_ENTITY_HANDLING</code></strong>.
<div class="methodsynopsis dc-description">
<span class="methodname"><span class="replaceable">handler</span></span>
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$parser</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$prefix</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$uri</code></span>
)</div>
<dl>
<dt>
<span class="term"><em><code class="parameter">parser</code></em></span>
<dd>
<span class="simpara">
The first parameter, <span class="replaceable">parser</span>, is a
reference to the XML parser calling the handler.
</span>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">prefix</code></em></span>
<dd>
<span class="simpara">
The prefix is a string used to reference the namespace within an XML object.
</span>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">uri</code></em></span>
<dd>
<span class="simpara">
Uniform Resource Identifier (URI) of namespace.
</span>
</dd>
</dt>
</dl>
</p>
<p class="para">
If a handler function is set to an empty string, or <strong><code>FALSE</code></strong>, the handler
in question is disabled.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">Instead of a function name, an
array containing an object reference and a method name can also be
supplied.</span></p></blockquote>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.xml-set-start-namespace-decl-handler-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <strong><code>TRUE</code></strong> on success or <strong><code>FALSE</code></strong> on failure.
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.xml-set-start-namespace-decl-handler-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.xml-set-end-namespace-decl-handler.html" class="function" rel="rdfs-seeAlso">xml_set_end_namespace_decl_handler()</a> - Set up end namespace declaration handler</span></li>
</ul>
</p>
</div>
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